Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1a3f7746ab67a3…

MALICIOUS

PDF

85.3 KB Created: 2021-04-18 22:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f419367087a0aa0368ddc96788f9ce32 SHA-1: cd5326c1c4def01828d8cbd0073338be9c14efbd SHA-256: bd1a3f7746ab67a3473c88eeeaf19c4136b5daa4705fae60f825073dcf50e0f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable or unknown domains, suggests a phishing or link farm attack. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=motorola+g6+play+review+uk PDF link annotation
    • http://vivekawiga.sportsontheweb.net/zumefum.pdfIn PDF document text
    • http://kumorepo.22web.org/can_i_use_5w30_instead_of_sae_30_in_my_lawn_mower.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/dBhjgga/learn_how_to_play_piano_online_free.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://dobataxip.iblogger.org/second_law_of_thermodynamics_example_problems_with_solutions.pdfIn PDF document text
    • http://copyright-services-us.com/20020445771llzgf.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/icg6Khc/13880391889.pdfIn PDF document text
    • https://cdn.sqhk.co/babakobesuxe/jaiaxib/90219440401.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/gjjuXTX/bunademoxidevuwowadujure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firasakujataj.epizy.com/80130665725.pdfIn PDF document text
    • http://munekekenagixo.rf.gd/ansys_topology_optimization.pdfIn PDF document text
    • http://jokosen.atwebpages.com/what_hawaiian_moon_phase_is_tonight.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/the_poisoners_handbook_film.pdfIn PDF document text
    • http://pafemovokixap.rf.gd/debakexekaxujuna.pdfIn PDF document text
    • http://dufazovuko.epizy.com/zewegeromoxari.pdfIn PDF document text
    • http://gigefokuwubuk.rf.gd/android_binder.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/biology_class_10th_notes.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/33159269806.pdfIn PDF document text
    • http://gisipevuzugofij.epizy.com/oxford_bookworms_stage_starter.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 5288 bytes
SHA-256: 109246fbdfea00c2dab2c4e7cb2e6dc8f9e9677982256bc34050426d3d679dc3
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 12144 bytes
SHA-256: 41ab83c1508f02f1bdb70dffc57dbe020d67bac80fc00843f5155872df936bfc
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16616 bytes
SHA-256: fe3c4ccd49fb7d77a133342d4ae2ccb7158abc4790a7ae71282673f42c3260e4

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